This appears to link to a free basic guide.

---------- Forwarded message ---------
From: AH Systems <updates@ahsystems.com>
Date: Wed, Feb 14, 2024 at 08:13
Subject: Shielding Effectiveness Solution
To: Karl Semich <0xloem@gmail.com>


Solve your testing challenges with these antenna kits and preamplifier solutions.
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Shielding Effectiveness Solutions

The isolation effects of shielded enclosures are only as good as their ability to prevent RF fields from extending inward or outward beyond their walled boundaries. Engineers, designers, and scientists cannot take that for granted. Here are some shielding effectivness test solutions to help solve your testing needs.
AK-285R/T - 1 KHz to 18 GHz
The A.H. Systems AK-285R and AK-285T antenna kits include all of the required antennas needed to perform shielding effectiveness. Each component has a specific storage compartment in the carrying case, therefore loss and breakage are virtually eliminated.
Preamplifier - 20 MHz to 40 GHz
An easy solution to increasing your dynamic range is with the use of a preamplifier. We offer many different models that cover a broad frequency rage.
Loop Antennas - 1 KHz to 30 MHz
A.H. Systems manufactures a wide variety of loop antennas in the frequency range of 20 Hz to 30 MHz that are primarily used to measure the magnetic field strength at lower frequencies.
Shielding Effectiveness Test Guide - Free download
Go ahead and grab a copy of this basic test guide in performing a shielding effectivness testing. This document reviews some of the issues and considerations in testing RF enclosures. Of particular importance is the need to evaluate shielding effectiveness and develop enclosure compliance test plans. Download your free digital copy today!